Add mount wait loop to grow-ssd service

[Copilot]

The grow-ssd one-shot service marks itself down on exit. If it runs before /ssd mounts, it exits immediately and never retries, leaving the partition ungrown.

Changes

• Add 60-second wait loop that polls for /ssd mount before attempting partition growth
• Skip wait if /ssd already mounted at service start
• Differentiate error messages based on whether timeout occurred

Implementation

# Wait for /ssd to be mounted (up to 60 seconds)
MAX_WAIT=60
WAITED=0
SSD_DEV=$(findmnt -n -o SOURCE /ssd 2>/dev/null || echo "")

case "$SSD_DEV" in
    /dev/*) 
        # Already mounted, proceed
        ;;
    *)
        # Not yet mounted, wait for it
        echo "grow-ssd: waiting for /ssd to be mounted..."
        while [ $WAITED -lt $MAX_WAIT ]; do
            SSD_DEV=$(findmnt -n -o SOURCE /ssd 2>/dev/null || echo "")
            case "$SSD_DEV" in
                /dev/*)
                    echo "grow-ssd: /ssd is mounted on $SSD_DEV"
                    break
                    ;;
            esac
            sleep 1
            WAITED=$((WAITED + 1))
        done
        ;;
esac

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